Reducing automotive energy use by a half or two thirds would have an extremely large impact, especially if you consider all of the new autos that will be coming online in India+China. Sure, we still need to switch power generation to cleaner tech as well, but this simplifies the solutions greatly, as power generation will then be concentrated. If we can stop focusing our national attention on trying to secure our oil supplies, we have a better chance at solving the problem as well.
